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We have been discussing about possible penalties with Yahoo. One of the possible reasons i Yahoo guidelines is about mirroring a site and duplicate content.
When I discovered my sites got a penalty, that is the URLs are in Yahoo database but not available i SERPS, I found many sites that seem to contain a mirror of my sites. At first look I thought the sites had created mirrors and were using them to attract search engine visitors. I even contacted some webmasters and told them to remove the mirrors. They claimed they had no mirrors and didn't understand.
After checking things out even further it seems the error is in fact at Yahoo and I want to explain as far as my English goes.
I searched for a popular keyword for one of my sites and instead of one of my sites there was a site with my title and description the same as my page and it appears to be a mirror but is in fact a PHP generated url. Yahoo seems to pick up the PHP url but does not understand this is a link but not a site.
My understanding is that Yahoo is treating PHP links differently from other links.
